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GCN Circular 17991

Subject

GRB 150702A: Swift-XRT observations

Date

2015-07-05T11:52:48Z (9 years ago)

From

Phil Evans at U of Leicester <pae9@leicester.ac.uk>

P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A. D'ai (INAF-IASFPA), T.G.R.
Roegiers (PSU), L.M. McCauley (PSU), J.A. Kennea (PSU), J.P. Osborne
(U. Leicester), K.L. Page (U. Leicester), C. Pagani (U. Leicester) and
P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:

Swift-XRT has performed follow-up observations of the
Fermi/LAT-detected burst GRB 150702A (Vianello et al. GCN Circ. 17989Not found
 
 
),
collecting 4.5 ks of Photon Counting (PC) mode data between T0+167.6 ks
and T0+180.0 ks. 

Two uncatalogued X-ray sources have been detected, however none of them
is above the RASS limit or shows definitive signs of fading. Therefore,
at the present time we cannot identify which, if any, is the afterglow.
Details of these sources are given below:

Source 1:
  RA (J2000.0):  53.1085  =  03:32:26.05
  Dec (J2000.0): -57.0628  =  -57:03:46.1
  Error: 9.8 arcsec (radius, 90% conf.)
  Count-rate: (3.6 +/- 1.7)e-3 ct s^-1
  Flux: (1.42 +/- 0.67)e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)

Source 2:
  RA (J2000.0):  52.7486  =  03:30:59.65
  Dec (J2000.0): -56.9320  =  -56:55:55.1
  Error: 7.7 arcsec (radius, 90% conf.)
  Count-rate: (1.57 [+0.85, -0.66])e-3 ct s^-1
  Flux: (6.3 [+3.4, -2.6])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV)

The results of the XRT-team automatic analysis of the XRT observations,
including a position-specific upper limit calculator, are available at
http://www.swift.ac.uk/ToO_GRBs/00020541.

This circular is an official product of the Swift-XRT team.